PR/32631: Yves-Emmanuel JUTARD: Fix DIAGNOSTIC panic in the pool code. At
the time pool_get() calls pool_catchup(), pp has been free'd but it is still
in the "entered" state. The chain pool_catchup() -> pool_allocator_alloc()
-> pool_reclaim() on pp fails because pp is still in the "entered" state.
Call pr_leave() before calling calling pool_catchup() to avoid this.
Thanks for the excellent analysis!